2007 Fiscal Year Final Research Report Summary
Effects of high pressure hydrogen gas on the fatigue strength for long-term use in candidate materials for the fuel cell system
| Project/Area Number |
17360052
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | Kyushu University |
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Principal Investigator |
NOGUCHI Hiroshi Kyushu University, Faculty of Engineering, 教授 (80164680)
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| Co-Investigator(Kenkyū-buntansha) |
HIGASHIDA Kenji KYUSHU UNIVERSITY, Faculty of Engineering, Professor (70156561)
HAMADA Shigeru KYUSHU UNIVERSITY, Faculty of Engineering, Associate Professor (90432856)
ODA Yasuji KYUSHU UNIVERSITY, Faculty of Engineeing, Assistant Professor (20091340)
AONO Yuta KYUSHU UNIVERSITY, Faculty of Engineering, Research Associate (70264075)
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| Project Period (FY) |
2005 – 2007
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| Keywords | Hydrogen / Fuel cell / Metal fatigue / Crack oronaeation / Crack initiation |
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| Research Abstract |
In order to ensure the safety of materials of a fuel cell system against long-term fatigue in high pressure hydrogen gas environment, it is necessary to clarify the characteristics of hydrogen entry into the material and the effects of internal hydrogen and hydrogen gas on the fatigue characteristics and the fatigue mechanisms.
(1) Measurements of hydrogen content in SCM 435 show that a plasma-charged sample contains 0.25 ppm hydrogen, which is 5 times in non-charged sample. The hydrogen plasma has ability as an alternative of high- pressure gas hydrogen environment However, the data are spread. Discussion of another plasma generation method or measures against heat evolution is required.
(2) Fatigue life of plain specimen cannot explain the effects of hydrogen gas environment, because hydrogen gas lengthen the fatigue crack initiation life, while shorten the fatigue crack propagation life.
(3) Degree of fatigue crack acceleration by hydrogen is different among materials: SUS304, SUS316L, SUS310S and A6061-T6.
(4) Slip-off mechanism is valid even in hydrogen gas environment in a certain range of fatigue crack growth.
(5) It is considered that the traditional assessment technique for the fatigue crack growth based on slip-off is effective and addition of the effects of diffusion rate to the assessment technique is a next object.
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[Presentation] Effects of Hydrogen Environment on Fatigue Crack Growth Rate and Its Dependence on Testing Frequency in Stable Austenitic Steel JIS SUS310S2006
Author(s)
K., Kawamoto, Y., Oda, H., Noguchi, K., Higashida
Organizer
Mechanical Engineering Congress, 2006, Japan
Place of Presentation
Kumamoto, Japan
Year and Date
20060918-22
Description
「研究成果報告書概要(欧文)」より
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